A phrase commonly used amongst the UK Garage collective 'The Pay As U Go Crew' expressing the greatness of an action or incident. This phrase soon became widely popular within schools around London circa 1999-2000.
Nah blud, you're going on weighty.
That girl's back-off was weighty.
These chips are weighty...ooh yeah...just like K-Ci!
another word for hectic, buff, kriss, heavy, gwan tings, ruff,
that bwai's bussin some weighty trainers!